Radio Control: Electrics

Radio Control E lectrics Bob Kopski SOME Electnc meets 1987 have nounced First Houston SPARKS Silent Propelled Aircraft Radio Kontrol Society will hold Third Annual Spring Electric Fun-Fly April 10-11 Cullen-Barker Park Dick Scobee Memorial Flying Field Several events planned will conducted accordance Electric rules proposals published February 1987 ModelAviation Competition Newsletter section SPARKS President Ken Martin tells new Dick Scobee field kely top country . having main hardsurfaced runway measuring 80 ft 320 ft grass cross-runway measuring SOft 240 ft has other features including 120-volt outlets water fountains rest rooms paved park ing etc information please contact Contest Director Eddie Thomas 1427 Ashwood Drive Sugar Land TX 77478 tele phone number 713 491-3375 can also contact Ken Martin 713 933-1688 Next Charlie Sylvia tells July 19 date set Third Annual South Shore Electric Fly Mailers detalls can Charlie 31 Perry St Middleboro MA 02346 Once agaln want encourage readers information such above send early column being written last week January issue dated May should appear door early Apriltoo close SPARKS date comfort Electric safety just important other kind safety light want direct attention Mitch Polings Silent Power column February 1987 issue Model Builder reference useful Electric modelers anyone using lead/acid batteries such used power starters gas engines Lead/acid batteries have characteristic liberating hydrogen gas during charging hydrogen presence oxygen air breathe spark such loose terminal connection can produce powerful explosion nothing new fact new car owners manuals Ive seen go great length describing safe charging lump-start ing procedures same reason Pleaseread Mitchs referenced column careful Mitchs column also reprinted part John Prestons Safety Comes First column April issue maga zine RMcM Incidentally same issue ofMB has story history current capability Americas oldest Electric model motor manufacturer Astro Flight youve ever wondered its done read article after read Mitchs column Electric columnist Jim Zarembski RCMs Silent Power writer past 11 years has 52 Model Aviation Equipment installation Kopakis Lanzo Bomber Light-colored triangular oblect left airacoop motor battery pack Box flight-control servos goes top everything held nylon bolt other side fuselage middle hatch wooden motor-control cam mounted servo actuates micro switch RC gear includes 250 mAh battery pack Sliver Seven receiver Tight fit Neat installation Astro Viking Note fuse arrow witn insulated spade-lug connectorsa short circuit power-system pack resulting use uninsulated lugs could result serious fire Cooling air 7-cell peck enters through windshield flows through/around cells out bottom RC gear behind motor pack includes receiver 250 mAh battery pack pair S33 servos Does RogerTaylor San Diego CA love Electrics face tells Model isa 500-sq-in So Long powered geared 05 cobalt swinging Rev-Up 11 x 71/s prop Energy storage seven 800 mAh Ni-Cd cells All-up weight 42 oz Photo J Alaback SOMETHING NEW & BETTER! THE DU CMtTPf4 SPORT/TRAINER SIMPLE TO BUILD EASY TO FLY TRAINER -ORBUILD IT WITh AILERONS AND DO IT ALL Years ago author Bob Kopski built fleet night-flying sport planes pod-mounted FLY WiTh 15 TWO CYCLE motors columnexpiainsWhYhedOeSfltOR 20 FOUR CYCLE ENGINE recommend podsfor Electrics SilentStaril Above used rewound geared slot-car motor Silent Star IV Below used 05 Small lights inside yellow-MonoKOted fuselage wing tipsbeautiful night spotiightwas nose Theywere rudderonly planes OR WITh 06 ELECTRIC MOTOR 48 SPAN SQ IN Z SELECTED DIE AND MACHINE CUT BALSA AND PLYWOOD COMPLETE ROLLED PLANS STEP-BY-STEP INSTRUCTIONS ALL HARDWARE AND FORMED GEAR just informed hes retiring column Jim has recently taken new job acquired new home finds time premium So hes relinquishing spot atRCM Bob Sliff Hobby Horn CA EAA Electric Aeromodeling Association fame Ive faithful reader Jims years recent years have pleasure meeting him several Electric Flys Jims writing Electric model designs highly instrumental easing through early Electric years want say Thank Jim best wishes future As aside above Jim recent ________________________ years associated Electric Model Designs company supplying kits several Jims designs including very successful Sky Knight Electraglide EMD has pur chased Bob Sliff/Hobby Horn under stand Bob will continue manufacture EMD kits Motors pods have brought several letters lately Readers questions matter basics like Will work can done reader expressed interest removable pod could hide evidence purist Sailplane buddies Lets look subject some detail FirstElectric motors pads work well SecondI dont recommend putting Electric motors pods Ive never knowingly accused being confusing can see may close now Anyway back Seventies built total eight power-pod planes night fliersie fully illuminated fully capable safe flight total darkness Four Twi-Flite through Four gaspowered others Silent Star through Four electric-powered planes less Gliders seven flew rudder-only three being pulserudder Out several-years experience Continued page 162 May1987 53 $449 IDAVEY h4SYSTEMS U CORPORATION ONE WOOD LANE MALVERN PA 19355 215 6444772 ASK YOUR DEALER Puzzled CALL MATT Notlmfo build nuttdit Ill lhuvetletim .umdkowhow 1 Complete 2 Semi-Assembled reedy cover sanded Call 9am -8pm ESTI 609-395-1672 Send prices Kits Engines accessories Mutti Model Building Crambury NJ 03512 catalogs available$3 Rate cards available free SASE 4-1 18x 9-1121 also build Cars Boats 00 CHAMPION FF KITS Wake-Up Wakefield Champion Coupe Upshot Mulvihili CHAMPION RUBBER 3132 1/8 3/16 & 1/4 widths 042 thick $1195/lb box* CATALOG $100 CHAMPION MODEL PRODUCTS 880 Carmen Ct La Verne CA 91750 714 599-3348 Includes US delivery via UPS add 6% tax Mason-Dixon Line winter north summer farther north better distinctly recall getting rather alarmed seeing flushed faces gross perspiration short ness breath general fatigue observed SAM Champs held LaJunta CO flirting disaster West Texas turns out hot calm next July Tim Banazak mentioned concern SAM banquet put down because Having SAM Champs winter months would interfere school young people What young people Ive never seen school-age youngster compete SAM event matter us dont have school-age children just dont think objection valid point Id personally much rather use some vacation time observe fly SAM Champs held January Sun Belt half-kill myself heat summer about DeeB Mathews 909 MaizeRd Townhouse 734 Wichita KS 87212 RC Electrics/Kopski Continued page 53 came some quite firm lessons 1 Flying total darkness perfectly doable downright fun too hard modelers believe being 2 Gas flying total darkness mess full daylight 3 Electric motors pods can fly very well can also genuine paln photos show two highly successful Elec tric night fliers fact planes flew very well sorta self-evident rudderonlythey well-behaved Anyway motor/pods installed just front leading edge wing height just sufficient prop clearance installations tractor except Gas pusher thrust lines set zero down zero side models otherwise normal flatbottomed airfoil sections ranging thickness 10% 12% Wings typically set angle inci dence positive two three degrees stabs zero degrees Balance points classic 30-33% Wing loadings typically eight ounces Gas 10-11 oz Electric Flight 162 Model Aviation speed relatively slow rudder surfaces throws relatively large Andexcept couple radio-battery rundownsI never nighttime flight difficulty need go find plane over active period several years So dont recommend motors pods Strictly mechan ical/structural reasonsthe paln part story Electric motors comparatively heavy turns out experience cannot make pod strong enough hold up under normal flight usage relatively minor landing bump causes severe load pod/pylon structure damage same guaranteed fact beginning spent time repalring pods doing anything else finally reached point attached pod fuselage tongue-and-groove arranged friction slip-joint screwadjusted tightness allowed entire pod assembly pull free fuselage needed put motor/pod flailing about mode constrained motor wires did put stop continuing structural destruction reasons motors pod first place could install spotlight nose motor would normally minimize motor interfacing ground because landing altitude impossible judge total darkness So unless have no choice ie some extreme reason installing motor conventionally sug gest avoid Electric motors pods Structur ally theyre pain mysteries motors continue bewilder readers especially newer Electric model ers Last month column offered some thoughts about updating upgrading way model motors characterized described modelers could eventually easily insight understanding relate motor size plane size Now Id like offer some thoughts information about Electric motors general idea illustrate Electric life might have gathered motors instruction manual now modelers know typical model motor has iron housing containing Continued page 170 FLYING SCALE MODEL RIC PLANS Super Detail os Instruction Sheets Smith Plans 19163 Shadowood Dr Send SASE -Monument CO 80132 UUUU U U U U U mmum U U..EU. SIG QUALITY FUELS Special Igniters improve cold starting idle characteristics * High Film Strength Additives increase lubricity provide maximum lean run protection * Special Detergents help prevent varnish promote clean burning * Rust Preventatives protect expensive engines corrosion SIG CHAMPION 2-STROKE FUEL FREIGHT FREE SHIPPING ON ORDERS OVER $1500COLLECT PINTQUARTGALLON55 GAL DRUM 0% Nitromethane$315$450$1050$19000 5% Nitromethane$365$525$1250$25800 10% Nitromethane$415$550$1450$32500 15% Nitrometharte$430$625$1650$38500 25% Nitromethane$495$750$2095$52000 35% Nitromethane$575$875$2495$66000 SIGPREMIUM4-STROKE FUEL 10% Nitromethane$415$550$1395$29500 15% Nitromethane$425$625$1595$35900 THE CHOICE OF CHAMPION FLYERS over 20 years SIG has blending fuel finest quality ingredients available alcohol 995% pure very best grade available nitromethane use 100% pure get honest portion based % volume masimum lubrication get perfect 50/50 blend Bakers AA Castor Oil Kiots Techniplate Racing Oil protect expensive engines finest quality fuel can made price Dont take word try some ludge yourself l See dealer first available order direct Call 800-247-5008 toll free orders Latest Catalog $300 LLJ SIG MANUFACTURING CO Montezuma IA 50171 Z Prio nobiect thong nothoot noirco CH Grant/Worth Continued page 93 undercamber warps Samples wings display AMA Museum kits highly prefabri cated requiring quick assembly flight model designs became well known time because flew wellnot true other models day Charlie knew adjust models result hours test flying preached testing models way really understand aerodynamics Charlies famous book Model Airplane Design Theory Flight also re printed Aero Science ofFree Flight bible anyone interested aspects aircraft stability pefformance both models full-scale aircraft Though source controversy some modelers disputed Charlies ideas con cerning model design book has sur vived test time still print available AMA Headquarters Another Charlies claim fame 1933 KG-i design built Joe Kovel model flying laboratory test Grants theories design stability hangs AMA Museum restored recent years Joe Kovel Charlie proud point out model completely stable both under power glide very common combination models early Thirties Aside aviation model engineering work Charles Hampson Grant probably best known modelers during Thirties editorship what premier model magazine Model Airplane News Charlie editor 1932 until 1943 During time organized Inter national Gas Model Airplane Association IGMAA used develop help then-fledgling AMA organization Charlie has often referred Father model aviation due such organizational promotional activities Through Model Airplane News magazine Grant published news Academy Model Aeronautics AMAs National Model Airplane Championships empha sizing club competition activity interest AMA particular youth participation model aircraft ac tivities continued through years until went hospital late 1986 telephone AMA Head quarters regularly always exploring what could applied past promote model aviation activity future people realize Grant very much involved development pilotless aircraft including design delta wing radio-controlled aerial tor pedo worked Army Air Corps Wright Field Ohio aircraft en gineer 19 18-19 also pursued develop ment Vertical Take Off aircraft designs Charlie now peace world quiet unsettling has much part aeromodeling over 60 years now avoid obvious no else can fill Charlies shoes kinda tireless dedicated dynamo energy active singlemindedness purpose Charlie wanted everyone aware share love aviation aeromodeling tunately left heritage will last years inspire others special exhibit area AMA Museum shows unique items Charles Hampson Grant famous dis play will assure achievements will forgotten RC Electrics/Kopski Continued page 162 permanent magnets rotating armature wire wound armature poles model motors generally have two electrical connections wires connect battery switch fuse etc Voltage applied wires ultimately applied armature windings means brushes ride rotating armature commutator latter nothingmore moving set contactselectrically con nected armature windingswhich picks up voltage stationary spring-loaded brushes rotates between against physical makeup motor including magnetic properties number arma ture poles winding turns determines certain basic motor characteristics capabilities Thus six-cell motor presumably config ured characterized very good job 170 Model Aviation IA Grant memorial display case 158 tea tured exhibit AMA Museum also known National CenterforAeromod cling Reston VA AMA HO building turning some specified prop specific speed near maximum desired currenton six cells Very often modelers confuse such characteri zations being thing motor can other hand Ive seen modelers pay very little attention recommendations go try what want anywaylike adding cells increasing prop sizeto get power Both reactions wrong Lets move right some specifics Yes perfectly OK use motors voltages number cells other adver tised numberprovided aware understand what doing obvious common realization use speed control Speed controls actually vary average voltage applied motor change its speed Specifically speed control response transmitter throttle stick varies voltage getting motor terminals full zero between Thus its perfectly OK apply lower voltages given motor/prop either such control using fewer cells varying resistance motor/battery circuit done some model cars As simple obvious may seem some readers know its others Going other direction perfectly OK use higher-than-advertised voltagesprovided allow certain other considerations general motors characterized advertised R hJ operate near-maximum capability usually meaning near maximum recommended current some number cells some specific prop simply add cells given combination brush/commutator dam age almost certaln However same time smaller prop used some addi tional voltage could safely applied because smaller prop would have first lowered current being drawn motor thereby left room current rise resulting higher voltage Id like repeat emphasis first governing limiting concern varying motor voltage prop size upward keeping motor current safe levels does know what current Thats tough part thats another reason last months column what its worth personal guidelines limit current Astro cobalts welded commutator connections 20 amps Astro Super Ferrite earlier cobalts soldered commutator connections set limit 15 amps economy Astro can-type motors use 12 amps max have less feel derivatives car motors such Kyosho seriesIm using 13-14 amps max now Theres quite variety Mabuchi motors out therewith differencesso no guide line possible ofyou some insight will immediate ly see general can put some power motor simply reducing prop size increasing cell count comes question whether such useful power smaller prop turns faster given model may effective larger slower prop lower motor power see faster always better Another application bit information involves use speed reducers Very often given motor speed reducer can used cells would practical direct drive reason just given typical car motors Thus given safe current limit voltage can often usedie power can usedwith speed reducer suitable propeller selection brings us consider yet another situa tionnamely using fewer cells larger prop fact routinely Again governing limitation maximum motor current Indeed over very broad range operating conditionscell count prop diameter prop pitch prop brandthe motor current thing influential what can done safelyie risk motor warrants special note possi ble use too cells too small prop resulting too high rpm below safe current limits high rpm risks mechanical damage like windings being physically thrown off As specific example have two planes using cobalt 15s turning 8 x 6 nylon props eight 12 May1987 171 MAGIC MAGNETMagnetIcally holds balsa COflStflJCtOd DUPLICATOR MKIPat model parts place gluslng No THfCanto BUILDERmore damaged splIt wood us-AU NEW ur Shaper Sander ~LNOW WITH REDUCIng pins Great Tool Made Greater. PRICEYonnowbuildwlthspeedelmplicl-mawIemaluamad FOUR DUPLICATOR MKI OURty accuracy Makes other methods PACKAGES AVAILABLE NEWESTobsolete WIll last forever used properly Boxed convenient storagema lea mjauig can mounted wodc bencham OUUaYUI lASS J nmmplus 2W X 1W ddmer Talk modelor has oneSaM lflSW 68796 add SI 001w hkW 2 DUPLICATOR MOO STANDARD oontakw 2W X 3 mdcklback sandpaper 7-i5Opams 1 16X 48 steal plate 1/4 grid lines allows building accurately C 1296 add 62001w shippIng plans3 DUPLICATOR MIU LEADING IDOl PACKAGE Can build up 1/4 scale ~C andpapm-tSI 30 Extremely strong commercial magnets allowing large amount assembl- ing edge panama gauge far asiedlflg pabm ing before gluelng 62496 add 6300 aftlpping 60- MagnetIc poles adds strength magnets4 DUPLICATOR MW DILUX 10 5 Uprights accurately holds constructed fuselage aides assemblin00115k 2 DIJpIIOI5 2W XC rI UcIdbmnasPer pattern gauge together-eo panama 1w comma 10- Bolts nuts asaembllng magnets uprights151W patterna teeing adgas Magic Magnet Builder also used architects model railroad boat builders15-150 patterns flat tOwel edgee doilhbuse fufniture builders etc3 HInge poInt patterns aening eeid awfmp hinge edge. S4euUrn 1w ELDON J LIND CO $7995 Caravelie Lake Havaau City Az 86403 602 453 7970 Add 65 shippingAt trour dealer order direct MIC & Visa accepted Send aalf-addraaaad stamped anvelope catalog ill products IEAST Tony Frackowiaks Challenge IV Kit Hattori Pipes Headers ASANO Laminated wood props RC Acrobatic Specialists PO Box 388914-248-8603 Lincolndale NY 10540 Send $100 catalog HOBBYPOXY TRUE TWO-PART EPOXY RIIINTS 16 COLORS R ER EPOXY GWES FOUR FORMULAS N 10 45-MiN FAST FILL GRAIN FILLER QUICK-PREP POLYESTER RESIN FREE COLOR CARD AND BROCHURE HO55YPOXY 01 VISION P011 Paint company 36 Pine Street AOckaAey NJ 07866 Fokker D-VII VK Model Aircraft PO Box 3007 Aurora 1160505 312-357-1883 Complete Line Exhaust Systems * TunedMuffled Tuned Pipes * Headers uri Mufflers Expansion Mufflers opter Ball Mufflers ialized Exhaust Systems Unsurpassed Workmanship & Performance BSI*dIillHl ZIUDU8azaEI 7555 Se, Geb,eI Roed cedero CA 93422 480-1717 Ah cells motor normally thought 12-cell motor am doing Because want kind prop speed about 9400 current about 17 amps power about 140 watts plane Spectra Stunt weight 42 oz thats Now realize above hardly covers topic full probably raises questions answers Good Thats part did thats indicative used last months column encourage better meaningful motor descriptions see can great deal other what advertised just little insight understandingand current meter tach Additional reading subject matter may also found About Elec trics October November 1983 issues magazine See column April 1986 also February 1987 infoon current meters Please forward comment question SASE please author Bob Kopski 25 West End Dr Lansdale PA 19446 PS respond letters requesting info help some requesting nothing Normally write mall responses within week Frequently get involved overtime business travel etc getting information respond response time longer Whatever respond everyone appropriate youve written didnt get iny reply within few weeks did get letteror did get Dont get angry get another piece paper try agaln RC Giant Scale/de Vries Continued page 55 history next best thing winning sweepstakes Dont forget big IMAA Festival Con verse INJune 11-14 See Rally Giants John de Vries 46lOMoffat Ln Colorado Springs CO 80915 RC Pylon Racing/Hager Continued page 56 CA 92701 Donna organizations treasurer year See next month Bill Hager 706 Glen Haven Dr Conroe TX 77385 RC Helicopters/Jolly Continued page 57 rotor engage clutch grabs nine times out 10 will knock blades out track As precaution squirt little fuel bell housing prior flight lubricates clutch cures problem manual includes excellent instructions balancing tracking rotor blades Set up exactiy according instructions exception Once rotor blades square lock down securely Hot Stuff blade grips seesaw important because allow blades swing will go out track flight causing excessive vibration autogyro operates flight 172 Model Aviation hate PRODUCTS install hinges Try Easy Hinges See Ihe Difference single slot few drops C/A glue its done No gouging pinning hinge pins worry obout Incredibly strong 24 hinges 0295 Vrtuu y ndest uCtb e P0 Box 1743 Marcos CA 92069 89O AVAILABLE AT AMERICAS FINEST HOBBY SHOPS $495 DISTRIBUTED BY

Radio Control E lectrics Bob Kopski SOME Electnc meets 1987 have nounced First Houston SPARKS Silent Propelled Aircraft Radio Kontrol Society will hold Third Annual Spring Electric Fun-Fly April 10-11 Cullen-Barker Park Dick Scobee Memorial Flying Field Several events planned will conducted accordance Electric rules proposals published February 1987 ModelAviation Competition Newsletter section SPARKS President Ken Martin tells new Dick Scobee field kely top country . having main hardsurfaced runway measuring 80 ft 320 ft grass cross-runway measuring SOft 240 ft has other features including 120-volt outlets water fountains rest rooms paved park ing etc information please contact Contest Director Eddie Thomas 1427 Ashwood Drive Sugar Land TX 77478 tele phone number 713 491-3375 can also contact Ken Martin 713 933-1688 Next Charlie Sylvia tells July 19 date set Third Annual South Shore Electric Fly Mailers detalls can Charlie 31 Perry St Middleboro MA 02346 Once agaln want encourage readers information such above send early column being written last week January issue dated May should appear door early Apriltoo close SPARKS date comfort Electric safety just important other kind safety light want direct attention Mitch Polings Silent Power column February 1987 issue Model Builder reference useful Electric modelers anyone using lead/acid batteries such used power starters gas engines Lead/acid batteries have characteristic liberating hydrogen gas during charging hydrogen presence oxygen air breathe spark such loose terminal connection can produce powerful explosion nothing new fact new car owners manuals Ive seen go great length describing safe charging lump-start ing procedures same reason Pleaseread Mitchs referenced column careful Mitchs column also reprinted part John Prestons Safety Comes First column April issue maga zine RMcM Incidentally same issue ofMB has story history current capability Americas oldest Electric model motor manufacturer Astro Flight youve ever wondered its done read article after read Mitchs column Electric columnist Jim Zarembski RCMs Silent Power writer past 11 years has 52 Model Aviation Equipment installation Kopakis Lanzo Bomber Light-colored triangular oblect left airacoop motor battery pack Box flight-control servos goes top everything held nylon bolt other side fuselage middle hatch wooden motor-control cam mounted servo actuates micro switch RC gear includes 250 mAh battery pack Sliver Seven receiver Tight fit Neat installation Astro Viking Note fuse arrow witn insulated spade-lug connectorsa short circuit power-system pack resulting use uninsulated lugs could result serious fire Cooling air 7-cell peck enters through windshield flows through/around cells out bottom RC gear behind motor pack includes receiver 250 mAh battery pack pair S33 servos Does RogerTaylor San Diego CA love Electrics face tells Model isa 500-sq-in So Long powered geared 05 cobalt swinging Rev-Up 11 x 71/s prop Energy storage seven 800 mAh Ni-Cd cells All-up weight 42 oz Photo J Alaback SOMETHING NEW & BETTER! THE DU CMtTPf4 SPORT/TRAINER SIMPLE TO BUILD EASY TO FLY TRAINER -ORBUILD IT WITh AILERONS AND DO IT ALL Years ago author Bob Kopski built fleet night-flying sport planes pod-mounted FLY WiTh 15 TWO CYCLE motors columnexpiainsWhYhedOeSfltOR 20 FOUR CYCLE ENGINE recommend podsfor Electrics SilentStaril Above used rewound geared slot-car motor Silent Star IV Below used 05 Small lights inside yellow-MonoKOted fuselage wing tipsbeautiful night spotiightwas nose Theywere rudderonly planes OR WITh 06 ELECTRIC MOTOR 48 SPAN SQ IN Z SELECTED DIE AND MACHINE CUT BALSA AND PLYWOOD COMPLETE ROLLED PLANS STEP-BY-STEP INSTRUCTIONS ALL HARDWARE AND FORMED GEAR just informed hes retiring column Jim has recently taken new job acquired new home finds time premium So hes relinquishing spot atRCM Bob Sliff Hobby Horn CA EAA Electric Aeromodeling Association fame Ive faithful reader Jims years recent years have pleasure meeting him several Electric Flys Jims writing Electric model designs highly instrumental easing through early Electric years want say Thank Jim best wishes future As aside above Jim recent ________________________ years associated Electric Model Designs company supplying kits several Jims designs including very successful Sky Knight Electraglide EMD has pur chased Bob Sliff/Hobby Horn under stand Bob will continue manufacture EMD kits Motors pods have brought several letters lately Readers questions matter basics like Will work can done reader expressed interest removable pod could hide evidence purist Sailplane buddies Lets look subject some detail FirstElectric motors pads work well SecondI dont recommend putting Electric motors pods Ive never knowingly accused being confusing can see may close now Anyway back Seventies built total eight power-pod planes night fliersie fully illuminated fully capable safe flight total darkness Four Twi-Flite through Four gaspowered others Silent Star through Four electric-powered planes less Gliders seven flew rudder-only three being pulserudder Out several-years experience Continued page 162 May1987 53 $449 IDAVEY h4SYSTEMS U CORPORATION ONE WOOD LANE MALVERN PA 19355 215 6444772 ASK YOUR DEALER Puzzled CALL MATT Notlmfo build nuttdit Ill lhuvetletim .umdkowhow 1 Complete 2 Semi-Assembled reedy cover sanded Call 9am -8pm ESTI 609-395-1672 Send prices Kits Engines accessories Mutti Model Building Crambury NJ 03512 catalogs available$3 Rate cards available free SASE 4-1 18x 9-1121 also build Cars Boats 00 CHAMPION FF KITS Wake-Up Wakefield Champion Coupe Upshot Mulvihili CHAMPION RUBBER 3132 1/8 3/16 & 1/4 widths 042 thick $1195/lb box* CATALOG $100 CHAMPION MODEL PRODUCTS 880 Carmen Ct La Verne CA 91750 714 599-3348 Includes US delivery via UPS add 6% tax Mason-Dixon Line winter north summer farther north better distinctly recall getting rather alarmed seeing flushed faces gross perspiration short ness breath general fatigue observed SAM Champs held LaJunta CO flirting disaster West Texas turns out hot calm next July Tim Banazak mentioned concern SAM banquet put down because Having SAM Champs winter months would interfere school young people What young people Ive never seen school-age youngster compete SAM event matter us dont have school-age children just dont think objection valid point Id personally much rather use some vacation time observe fly SAM Champs held January Sun Belt half-kill myself heat summer about DeeB Mathews 909 MaizeRd Townhouse 734 Wichita KS 87212 RC Electrics/Kopski Continued page 53 came some quite firm lessons 1 Flying total darkness perfectly doable downright fun too hard modelers believe being 2 Gas flying total darkness mess full daylight 3 Electric motors pods can fly very well can also genuine paln photos show two highly successful Elec tric night fliers fact planes flew very well sorta self-evident rudderonlythey well-behaved Anyway motor/pods installed just front leading edge wing height just sufficient prop clearance installations tractor except Gas pusher thrust lines set zero down zero side models otherwise normal flatbottomed airfoil sections ranging thickness 10% 12% Wings typically set angle inci dence positive two three degrees stabs zero degrees Balance points classic 30-33% Wing loadings typically eight ounces Gas 10-11 oz Electric Flight 162 Model Aviation speed relatively slow rudder surfaces throws relatively large Andexcept couple radio-battery rundownsI never nighttime flight difficulty need go find plane over active period several years So dont recommend motors pods Strictly mechan ical/structural reasonsthe paln part story Electric motors comparatively heavy turns out experience cannot make pod strong enough hold up under normal flight usage relatively minor landing bump causes severe load pod/pylon structure damage same guaranteed fact beginning spent time repalring pods doing anything else finally reached point attached pod fuselage tongue-and-groove arranged friction slip-joint screwadjusted tightness allowed entire pod assembly pull free fuselage needed put motor/pod flailing about mode constrained motor wires did put stop continuing structural destruction reasons motors pod first place could install spotlight nose motor would normally minimize motor interfacing ground because landing altitude impossible judge total darkness So unless have no choice ie some extreme reason installing motor conventionally sug gest avoid Electric motors pods Structur ally theyre pain mysteries motors continue bewilder readers especially newer Electric model ers Last month column offered some thoughts about updating upgrading way model motors characterized described modelers could eventually easily insight understanding relate motor size plane size Now Id like offer some thoughts information about Electric motors general idea illustrate Electric life might have gathered motors instruction manual now modelers know typical model motor has iron housing containing Continued page 170 FLYING SCALE MODEL RIC PLANS Super Detail os Instruction Sheets Smith Plans 19163 Shadowood Dr Send SASE -Monument CO 80132 UUUU U U U U U mmum U U..EU. SIG QUALITY FUELS Special Igniters improve cold starting idle characteristics * High Film Strength Additives increase lubricity provide maximum lean run protection * Special Detergents help prevent varnish promote clean burning * Rust Preventatives protect expensive engines corrosion SIG CHAMPION 2-STROKE FUEL FREIGHT FREE SHIPPING ON ORDERS OVER $1500COLLECT PINTQUARTGALLON55 GAL DRUM 0% Nitromethane$315$450$1050$19000 5% Nitromethane$365$525$1250$25800 10% Nitromethane$415$550$1450$32500 15% Nitrometharte$430$625$1650$38500 25% Nitromethane$495$750$2095$52000 35% Nitromethane$575$875$2495$66000 SIGPREMIUM4-STROKE FUEL 10% Nitromethane$415$550$1395$29500 15% Nitromethane$425$625$1595$35900 THE CHOICE OF CHAMPION FLYERS over 20 years SIG has blending fuel finest quality ingredients available alcohol 995% pure very best grade available nitromethane use 100% pure get honest portion based % volume masimum lubrication get perfect 50/50 blend Bakers AA Castor Oil Kiots Techniplate Racing Oil protect expensive engines finest quality fuel can made price Dont take word try some ludge yourself l See dealer first available order direct Call 800-247-5008 toll free orders Latest Catalog $300 LLJ SIG MANUFACTURING CO Montezuma IA 50171 Z Prio nobiect thong nothoot noirco CH Grant/Worth Continued page 93 undercamber warps Samples wings display AMA Museum kits highly prefabri cated requiring quick assembly flight model designs became well known time because flew wellnot true other models day Charlie knew adjust models result hours test flying preached testing models way really understand aerodynamics Charlies famous book Model Airplane Design Theory Flight also re printed Aero Science ofFree Flight bible anyone interested aspects aircraft stability pefformance both models full-scale aircraft Though source controversy some modelers disputed Charlies ideas con cerning model design book has sur vived test time still print available AMA Headquarters Another Charlies claim fame 1933 KG-i design built Joe Kovel model flying laboratory test Grants theories design stability hangs AMA Museum restored recent years Joe Kovel Charlie proud point out model completely stable both under power glide very common combination models early Thirties Aside aviation model engineering work Charles Hampson Grant probably best known modelers during Thirties editorship what premier model magazine Model Airplane News Charlie editor 1932 until 1943 During time organized Inter national Gas Model Airplane Association IGMAA used develop help then-fledgling AMA organization Charlie has often referred Father model aviation due such organizational promotional activities Through Model Airplane News magazine Grant published news Academy Model Aeronautics AMAs National Model Airplane Championships empha sizing club competition activity interest AMA particular youth participation model aircraft ac tivities continued through years until went hospital late 1986 telephone AMA Head quarters regularly always exploring what could applied past promote model aviation activity future people realize Grant very much involved development pilotless aircraft including design delta wing radio-controlled aerial tor pedo worked Army Air Corps Wright Field Ohio aircraft en gineer 19 18-19 also pursued develop ment Vertical Take Off aircraft designs Charlie now peace world quiet unsettling has much part aeromodeling over 60 years now avoid obvious no else can fill Charlies shoes kinda tireless dedicated dynamo energy active singlemindedness purpose Charlie wanted everyone aware share love aviation aeromodeling tunately left heritage will last years inspire others special exhibit area AMA Museum shows unique items Charles Hampson Grant famous dis play will assure achievements will forgotten RC Electrics/Kopski Continued page 162 permanent magnets rotating armature wire wound armature poles model motors generally have two electrical connections wires connect battery switch fuse etc Voltage applied wires ultimately applied armature windings means brushes ride rotating armature commutator latter nothingmore moving set contactselectrically con nected armature windingswhich picks up voltage stationary spring-loaded brushes rotates between against physical makeup motor including magnetic properties number arma ture poles winding turns determines certain basic motor characteristics capabilities Thus six-cell motor presumably config ured characterized very good job 170 Model Aviation IA Grant memorial display case 158 tea tured exhibit AMA Museum also known National CenterforAeromod cling Reston VA AMA HO building turning some specified prop specific speed near maximum desired currenton six cells Very often modelers confuse such characteri zations being thing motor can other hand Ive seen modelers pay very little attention recommendations go try what want anywaylike adding cells increasing prop sizeto get power Both reactions wrong Lets move right some specifics Yes perfectly OK use motors voltages number cells other adver tised numberprovided aware understand what doing obvious common realization use speed control Speed controls actually vary average voltage applied motor change its speed Specifically speed control response transmitter throttle stick varies voltage getting motor terminals full zero between Thus its perfectly OK apply lower voltages given motor/prop either such control using fewer cells varying resistance motor/battery circuit done some model cars As simple obvious may seem some readers know its others Going other direction perfectly OK use higher-than-advertised voltagesprovided allow certain other considerations general motors characterized advertised R hJ operate near-maximum capability usually meaning near maximum recommended current some number cells some specific prop simply add cells given combination brush/commutator dam age almost certaln However same time smaller prop used some addi tional voltage could safely applied because smaller prop would have first lowered current being drawn motor thereby left room current rise resulting higher voltage Id like repeat emphasis first governing limiting concern varying motor voltage prop size upward keeping motor current safe levels does know what current Thats tough part thats another reason last months column what its worth personal guidelines limit current Astro cobalts welded commutator connections 20 amps Astro Super Ferrite earlier cobalts soldered commutator connections set limit 15 amps economy Astro can-type motors use 12 amps max have less feel derivatives car motors such Kyosho seriesIm using 13-14 amps max now Theres quite variety Mabuchi motors out therewith differencesso no guide line possible ofyou some insight will immediate ly see general can put some power motor simply reducing prop size increasing cell count comes question whether such useful power smaller prop turns faster given model may effective larger slower prop lower motor power see faster always better Another application bit information involves use speed reducers Very often given motor speed reducer can used cells would practical direct drive reason just given typical car motors Thus given safe current limit voltage can often usedie power can usedwith speed reducer suitable propeller selection brings us consider yet another situa tionnamely using fewer cells larger prop fact routinely Again governing limitation maximum motor current Indeed over very broad range operating conditionscell count prop diameter prop pitch prop brandthe motor current thing influential what can done safelyie risk motor warrants special note possi ble use too cells too small prop resulting too high rpm below safe current limits high rpm risks mechanical damage like windings being physically thrown off As specific example have two planes using cobalt 15s turning 8 x 6 nylon props eight 12 May1987 171 MAGIC MAGNETMagnetIcally holds balsa COflStflJCtOd DUPLICATOR MKIPat model parts place gluslng No THfCanto BUILDERmore damaged splIt wood us-AU NEW ur Shaper Sander ~LNOW WITH REDUCIng pins Great Tool Made Greater. PRICEYonnowbuildwlthspeedelmplicl-mawIemaluamad FOUR DUPLICATOR MKI OURty accuracy Makes other methods PACKAGES AVAILABLE NEWESTobsolete WIll last forever used properly Boxed convenient storagema lea mjauig can mounted wodc bencham OUUaYUI lASS J nmmplus 2W X 1W ddmer Talk modelor has oneSaM lflSW 68796 add SI 001w hkW 2 DUPLICATOR MOO STANDARD oontakw 2W X 3 mdcklback sandpaper 7-i5Opams 1 16X 48 steal plate 1/4 grid lines allows building accurately C 1296 add 62001w shippIng plans3 DUPLICATOR MIU LEADING IDOl PACKAGE Can build up 1/4 scale ~C andpapm-tSI 30 Extremely strong commercial magnets allowing large amount assembl- ing edge panama gauge far asiedlflg pabm ing before gluelng 62496 add 6300 aftlpping 60- MagnetIc poles adds strength magnets4 DUPLICATOR MW DILUX 10 5 Uprights accurately holds constructed fuselage aides assemblin00115k 2 DIJpIIOI5 2W XC rI UcIdbmnasPer pattern gauge together-eo panama 1w comma 10- Bolts nuts asaembllng magnets uprights151W patterna teeing adgas Magic Magnet Builder also used architects model railroad boat builders15-150 patterns flat tOwel edgee doilhbuse fufniture builders etc3 HInge poInt patterns aening eeid awfmp hinge edge. S4euUrn 1w ELDON J LIND CO $7995 Caravelie Lake Havaau City Az 86403 602 453 7970 Add 65 shippingAt trour dealer order direct MIC & Visa accepted Send aalf-addraaaad stamped anvelope catalog ill products IEAST Tony Frackowiaks Challenge IV Kit Hattori Pipes Headers ASANO Laminated wood props RC Acrobatic Specialists PO Box 388914-248-8603 Lincolndale NY 10540 Send $100 catalog HOBBYPOXY TRUE TWO-PART EPOXY RIIINTS 16 COLORS R ER EPOXY GWES FOUR FORMULAS N 10 45-MiN FAST FILL GRAIN FILLER QUICK-PREP POLYESTER RESIN FREE COLOR CARD AND BROCHURE HO55YPOXY 01 VISION P011 Paint company 36 Pine Street AOckaAey NJ 07866 Fokker D-VII VK Model Aircraft PO Box 3007 Aurora 1160505 312-357-1883 Complete Line Exhaust Systems * TunedMuffled Tuned Pipes * Headers uri Mufflers Expansion Mufflers opter Ball Mufflers ialized Exhaust Systems Unsurpassed Workmanship & Performance BSI*dIillHl ZIUDU8azaEI 7555 Se, Geb,eI Roed cedero CA 93422 480-1717 Ah cells motor normally thought 12-cell motor am doing Because want kind prop speed about 9400 current about 17 amps power about 140 watts plane Spectra Stunt weight 42 oz thats Now realize above hardly covers topic full probably raises questions answers Good Thats part did thats indicative used last months column encourage better meaningful motor descriptions see can great deal other what advertised just little insight understandingand current meter tach Additional reading subject matter may also found About Elec trics October November 1983 issues magazine See column April 1986 also February 1987 infoon current meters Please forward comment question SASE please author Bob Kopski 25 West End Dr Lansdale PA 19446 PS respond letters requesting info help some requesting nothing Normally write mall responses within week Frequently get involved overtime business travel etc getting information respond response time longer Whatever respond everyone appropriate youve written didnt get iny reply within few weeks did get letteror did get Dont get angry get another piece paper try agaln RC Giant Scale/de Vries Continued page 55 history next best thing winning sweepstakes Dont forget big IMAA Festival Con verse INJune 11-14 See Rally Giants John de Vries 46lOMoffat Ln Colorado Springs CO 80915 RC Pylon Racing/Hager Continued page 56 CA 92701 Donna organizations treasurer year See next month Bill Hager 706 Glen Haven Dr Conroe TX 77385 RC Helicopters/Jolly Continued page 57 rotor engage clutch grabs nine times out 10 will knock blades out track As precaution squirt little fuel bell housing prior flight lubricates clutch cures problem manual includes excellent instructions balancing tracking rotor blades Set up exactiy according instructions exception Once rotor blades square lock down securely Hot Stuff blade grips seesaw important because allow blades swing will go out track flight causing excessive vibration autogyro operates flight 172 Model Aviation hate PRODUCTS install hinges Try Easy Hinges See Ihe Difference single slot few drops C/A glue its done No gouging pinning hinge pins worry obout Incredibly strong 24 hinges 0295 Vrtuu y ndest uCtb e P0 Box 1743 Marcos CA 92069 89O AVAILABLE AT AMERICAS FINEST HOBBY SHOPS $495 DISTRIBUTED BY